Sodium-ion battery system with good low-temperature performance

Abstract

The utility model relates to a sodium ion battery system with good low-temperature performance in the field of storage battery production, which comprises a battery cell module, a plastic bracket, a battery shell, a connecting bar, an epoxy plate, a PE insulating film and a protective plate, and the battery cell module is formed by connecting a plurality of sodium ion battery cell monomers in series and in parallel through a nickel strap connecting bar; the battery shell comprises a battery jar and a battery cover; the battery cell module is arranged in the battery shell through the plastic bracket; the insulating plate is arranged above the battery module in a covering manner, the protective plate is arranged between the insulating plate and the battery cover, an insulating film is also arranged between the protective plate and the battery cover, a battery positive electrode and a battery negative electrode are arranged on the battery jar, and the battery positive electrode and the battery negative electrode are electrically connected with the battery cell module through the protective plate. The sodium ion battery has good low-temperature performance and can better adapt to the low-temperature environment for use, meanwhile, the problems that an existing ternary lithium battery is short in endurance, short in service life, prone to swelling, prone to explosion and the like are solved, and the applicability and safety of a battery system are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery production, and particularly relates to a sodium-ion battery system with good low-temperature performance. Background Art

[0002] A storage battery refers to a mobile power storage device that can be repeatedly charged and discharged. The more common storage batteries mainly include lead-acid batteries and lithium-ion batteries. Currently, the 12V emergency starting power supplies on the market basically adopt high-rate ternary lithium polymer soft-pack battery cells. Due to the disadvantages of the ternary lithium polymer soft-pack battery itself, such as poor low-temperature starting performance, easy bulging after high-current discharge, and low ignition point, it is difficult to use the emergency starting power supply in winter, the battery life is greatly reduced, and the cycle life is short. Moreover, during use, the battery cells are prone to bulging and becoming unusable, and in severe cases, there may even be a risk of explosion and fire, posing a safety hazard during the use of the battery. Therefore, there is an urgent need to find a storage battery product with better low-temperature performance and higher safety factor. Content of the Utility Model

[0003] In view of the above situation, the utility model provides a sodium-ion battery system with good low-temperature performance. The sodium-ion battery itself has better low-temperature performance and can well solve the above technical problems existing in the ternary lithium battery emergency starting power supply in the prior art.

[0004] In order to achieve the above purposes, the utility model adopts the following technical solutions:

[0005] A sodium-ion battery system with good low-temperature performance includes a battery cell module, a plastic bracket, a battery housing, a connection row, an insulating board, an insulating film, and a protection board.

[0006] The battery cell module is composed of a plurality of sodium-ion battery cell monomers connected in series and parallel.

[0007] Further, the battery cell module is composed of three battery cell groups connected in parallel, and each battery cell group is composed of four sodium-ion battery cell monomers arranged in parallel and connected in series.

[0008] Further, the sodium-ion battery cell monomers are all high-rate cylindrical sodium-ion battery cells, and the upper and lower ends of each sodium-ion battery cell correspond to the battery cell positive electrode and the battery cell negative electrode respectively. The characteristics of the sodium-ion battery cell itself determine its good low-temperature performance.

[0009] The connection row serves as an electrical connection conductor for series and parallel connection between the sodium-ion battery cell monomers.

[0010] Further, the connection row is a nickel strip, and the battery cell positive electrode and the battery cell negative electrode of each sodium-ion battery cell are respectively and correspondingly positioned and welded to the positive nickel strip and the negative nickel strip.

[0011] The battery housing includes a battery cell groove and a battery cover covering the top of the battery cell groove; the battery cell module is supported and placed in the battery housing by a plastic bracket, and the periphery of the battery cell module is abutted and fixed against the inner side wall of the battery cell groove by a pressing strip.

[0012] Further, the battery cell groove is a square iron box body with an open top, and the battery cover is a rectangular iron cover plate matching the open top of the battery cell groove. The battery cover and the battery cell groove are fixedly connected by screws.

[0013] The insulating board covers the battery module, the protection board is arranged between the insulating board and the battery cover, and an insulating film is also arranged in isolation between the protection board and the battery cover.

[0014] Further, the insulating board is an epoxy board, the protection board is adhesively fixed on the epoxy board by foam adhesive, the epoxy board is adhesively fixed above the battery cell module, and an insulating film is integrally coated on the outside of the battery cell module and the protection board.

[0015] Further, the insulating film is a PE insulating film, which plays a role of insulating and isolating from the iron battery housing.

[0016] The battery cell groove is provided with a battery positive electrode and a battery negative electrode, and the battery positive and negative electrodes are electrically connected to the battery cell module through the protection board.

[0017] Further, both the battery positive electrode and the battery negative electrode are copper wiring terminals. An insulating seat is arranged between the battery positive and negative electrodes and the battery cover, and an insulating protective cover is also covered in cooperation on the battery positive and negative electrode wiring terminals to ensure the battery discharge overcurrent performance and mechanical installation performance.

[0018] Further, between the protection board and the battery cell module, and between the protection board and the battery positive and negative electrodes, silicone copper wires are used for electrical connection to ensure an efficient current passing effect.

[0019] This utility model further includes other components that enable it to be used normally, which are all conventional means in the art. In addition, for the devices or components not defined in this utility model, such as: cylindrical sodium-ion battery cells, nickel strip connection rows, epoxy boards, PE insulating films, and PCBA integrated circuit protection boards and their circuit settings, etc., the existing technologies in the art are adopted.

[0020] The beneficial effects of this utility model are as follows:

[0021] A sodium-ion battery system with good low-temperature performance provided by the present utility model solves the problems in use such as poor low-temperature performance, short endurance, short lifespan, easy bulging, and easy explosion of the battery by changing the battery material system and improving the battery system technology. Utilizing the characteristic that the sodium-ion battery itself has better low-temperature performance and adopting cylindrical sodium-ion battery cells, it can significantly improve the applicability and safety of the battery system compared with the ternary lithium battery emergency starting power supply in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the sodium-ion battery system in the embodiment.

[0023] In the figure: 1, battery cover; 2, battery slot; 3, single sodium-ion battery cell; 4, connection row; 5, bracket; 6, terminal; 7, protection board; 8, handle; 9, insulating board; 10, switch button; 11, display screen. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with specific embodiments. Obviously, the described embodiments are only partial embodiments of the present utility model, rather than all embodiments.

[0025] Embodiment

[0026] As Figure 1 shown, a sodium-ion battery system with good low-temperature performance includes a battery cell module, a plastic bracket 5, a battery housing, a connection row 4, an insulating board 9, an insulating film (not shown in the figure), and a protection board 7.

[0027] The battery cell module consists of three mutually parallel battery cell groups, and each battery cell group is composed of four sodium-ion battery cells 3 arranged in parallel and connected in series, with a total of twelve sodium-ion battery cells connected in series and parallel.

[0028] Each sodium-ion battery cell is a 32700 high-rate cylindrical sodium-ion battery cell with a diameter of 32 mm and a height of 70 mm. The upper and lower ends of each sodium-ion battery cell correspond to the battery cell positive electrode and the battery cell negative electrode respectively. The characteristics of the sodium-ion battery cell itself determine its good low-temperature performance. The sodium-ion battery cell is a prior art in the field of storage batteries, and its specific setting will not be elaborated here.

[0029] The connection row is a 32700 special nickel strip with a thickness of 0.2 mm, serving as the electrical connection conductor for the series and parallel connection between each sodium-ion battery cell. The battery cell positive electrode and the battery cell negative electrode of each sodium-ion battery cell are respectively and correspondingly positioned and welded to the positive nickel strip and the negative nickel strip through a laser welding device.

[0030] The battery housing includes a battery groove 2 and a battery cover 1 covering the top of the battery groove; the battery cell module is supported and placed in the battery housing by a plastic bracket, and the periphery of the battery cell module is abutted and fixed against the inner side wall of the battery groove by a pressing strip.

[0031] The battery groove is a square iron box with an open top formed by processes such as sheet metal, positioning and punching, welding, powder coating, and screen printing.

[0032] The battery cover is a rectangular iron cover sheet metal part that matches the open top of the battery groove, and the battery cover and the battery groove are fixedly connected by ten M4 screws. A handle 8 is also provided on the battery cover for convenient lifting and moving of the entire battery.

[0033] Two wiring terminals 6, namely the battery positive electrode and the battery negative electrode, are provided on the side wall of the battery groove, and the battery positive and negative electrodes are electrically connected to the battery cell module through a protection board.

[0034] A switch button 10 for controlling the on / off of the battery output and a display screen 11 for displaying battery-related parameters are also provided on the side wall of the battery groove.

[0035] Both the battery positive electrode and the battery negative electrode are 100A copper wiring terminals, and an insulating seat is provided between the battery positive and negative electrodes and the battery cover to achieve insulation isolation between the wiring terminals of the battery output end and the iron battery cover. In addition, insulating protective covers are also provided in cooperation on the battery positive and negative wiring terminals to ensure the overcurrent performance and mechanical installation performance of the battery during discharge.

[0036] The protection board is electrically connected to the battery cell module by an 8AWG standard silicone copper wire, and the protection board is electrically connected to the battery positive and negative electrodes by 6AWG standard silicone copper wires to ensure an efficient current passing effect.

[0037] The protection board is a PCBA integrated circuit board with functions such as overvoltage protection for charging, overcurrent protection, overheat protection, and intelligent balancing, which can effectively protect the charge and discharge consistency and safety during the use of the battery. The protection board and its circuit settings are all prior arts and will not be elaborated here.

[0038] The insulating board covers the battery module, and the protection board is arranged between the insulating board and the battery cover; the insulating board is an epoxy board, the protection board is adhesively fixed on the epoxy board by a foam adhesive, and the epoxy board is adhesively fixed above the battery cell module.

[0039] And a 0.2mm thick blue PE insulating film is integrally coated on the outside of the battery cell module and the protection board, and is coated on the outside of the battery cell module, the protection board, each connecting row, and the silicone copper wire through a heat shrinkage process. Finally, a label is pasted on the outside of the battery housing to complete the production of the battery pack.

[0040] The technical solution of the present utility model is not limited to the limitations of the above specific embodiments. Without departing from the scope and spirit of the described embodiments, many modifications and changes are obvious to those of ordinary skill in the art. Any technical deformation made within the spirit and principle of the present utility model falls within the protection scope of the present utility model.

Claims

1. A sodium-ion battery system with good low-temperature performance, comprising a battery cell module, a plastic bracket and a battery housing, characterized in that: It further includes a connection row, an insulating board, an insulating film and a protection board. The battery cell module is composed of a plurality of sodium-ion battery cell monomers connected in series and parallel. The connection row serves as an electrical connection conductor for series and parallel connections between the sodium-ion battery cell monomers. The battery housing includes a battery cell groove and a battery cover covering the top of the battery cell groove. The battery cell module is supported and placed in the battery housing through the plastic bracket. The insulating board covers the battery module. The protection board is arranged between the insulating board and the battery cover, and an insulating film is arranged in isolation between the protection board and the battery cover. A battery positive electrode and a battery negative electrode are arranged on the battery cell groove, and the battery positive and negative electrodes are electrically connected to the battery cell module through the protection board.

2. The sodium ion battery system with good low-temperature performance according to claim 1, characterized in that: The battery cell module is composed of three battery cell groups connected in parallel with each other. Each battery cell group is composed of four sodium-ion battery cell monomers arranged in parallel and connected in series.

3. A sodium-ion battery system with good low-temperature performance according to claim 2, characterized in that: The sodium-ion battery cell monomers are all cylindrical sodium-ion battery cells, and the upper and lower ends of each sodium-ion battery cell correspond to the battery cell positive electrode and the battery cell negative electrode respectively.

4. A sodium-ion battery system with good low-temperature performance according to claim 3, characterized in that: The connection row is a nickel strip, and the battery cell positive electrode and the battery cell negative electrode of each sodium-ion battery cell are welded to their corresponding connection rows respectively.

5. A sodium-ion battery system with good low-temperature performance according to claim 1, characterized in that: The battery cell groove is a square iron box with an open top, and the battery cover is a rectangular iron cover matching the open top of the battery cell groove. The battery cover and the battery cell groove are fixedly connected by screws.

6. The sodium-ion battery system with good low-temperature performance according to claim 5, characterized in that: The battery positive electrode and the battery negative electrode are both copper wiring terminals. Insulating seats are arranged between the battery positive and negative electrodes and the battery cover, and protective covers are also fitted and covered on the battery positive and negative electrode wiring terminals.

7. A sodium-ion battery system with good low-temperature performance according to claim 1, characterized in that: The protection board is electrically connected to the battery cell module and between the protection board and the battery positive and negative electrodes by silicone copper wires.

8. A sodium ion battery system with good low-temperature performance according to claim 1, characterized in that: The insulating board is an epoxy board, and the protection board is adhesively fixed on the epoxy board by foam adhesive.

9. A sodium-ion battery system with good low-temperature performance according to claim 8, characterized in that: The insulating film is a PE insulating film.

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